InChI=1S/C13H18N2O4/c1-8(16)11(14)12(17)15-10(13(18)19)7-9-5-3-2-4-6-9/h2-6,8,10-11,16H,7,14H2,1H3,(H,15,17)(H,18,19)/t8-,10+,11+/m1/s1